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Bug#503821: Also in domU's


On Wed, 29 Oct 2008, Lars Michael Jogback wrote:
> I've done some more tests.
> The problem seem to be related to swapping.

Thanks for figuring that out!

I tested this with the following configurations where except for the
kernel everthing else is from lenny (including the xen hypervisor
which is 3.2). The kernels are the stock kernels from Debian.

 dom0 kernel               domU kernel      result
 2.6.18-6-xen-amd64    2.6.18-6-xen-amd64   no crash
 2.6.26-1-xen-amd64    2.6.26-1-xen-amd64   crash for domU and dom0
 2.6.18-6-xen-amd64    2.6.26-1-xen-amd64   crash for domU
 2.6.26-1-xen-amd64    2.6.18-6-xen-amd64   crash for dom0

Moreover, in each case where there was a crash, disabling swap
prevented the crash (the oom killer took over of course!).

This clearly points to a problem which is in the way the kernel
2.6.26-1-xen-amd64 deals with swap.

This _is_ an RC bug. If people upgrade to lenny after it is released
and have repeated crashes due to swapping problems they will not
thank us.

The report which downgraded this bug report from "grave" to
"important" did not offer a reason.



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